react-native-gesture-handler/lib/module/components/Pressable/StateMachine.js

Declarative API exposing native platform touch and gesture system to React Native

"use strict";

class PressableStateMachine {
  constructor() {
    this.states = null;
    this.currentStepIndex = 0;
    this.eventPayload = null;
  }
  setStates(states) {
    this.states = states;
  }
  reset() {
    this.currentStepIndex = 0;
    this.eventPayload = null;
  }
  handleEvent(eventName, eventPayload) {
    if (!this.states) {
      return;
    }
    this.eventPayload = eventPayload || this.eventPayload;

    // Skip past optional steps that don't match the incoming event
    while (this.currentStepIndex < this.states.length && this.states[this.currentStepIndex].eventName !== eventName && this.states[this.currentStepIndex].optional) {
      this.currentStepIndex++;
    }
    if (this.currentStepIndex >= this.states.length) {
      this.reset();
      return;
    }
    const step = this.states[this.currentStepIndex];
    if (step.eventName !== eventName) {
      if (this.currentStepIndex > 0) {
        // retry with position at index 0
        this.reset();
        this.handleEvent(eventName, eventPayload);
      }
      return;
    }
    if (this.eventPayload && step.callback) {
      step.callback(this.eventPayload);
    }
    this.currentStepIndex++;
    if (this.currentStepIndex === this.states.length) {
      this.reset();
    }
  }
}
export { PressableStateMachine };
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